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THRESHOLDS

COUNT

OR PNP BIPOLAR TRANSISTORS

DESCRIPTION

TSM108 is a step-down PWM controller designed

to drive an external P-channel MOSFET, provid-

ing constant voltage and constant current regula-

tions in battery charger applications.

TSM108 can easily be configured for very wide

voltage and current needs.

It has been realized in rugged BCD technology

and includes a PWM generator, Voltage and Cur-

rent control loops, a precise Voltage Reference,

and a Gate Driver. The device can sustain 60V on

Vcc, and therefore meet the standard Load Dump

requirements of the 12V cars battery.

On boards there are other security functions which

lock the external power in OFF state: OVLO (Over

Voltage Lockout) and UVLO (Under Voltage Lock-

out). The mosfet gate is also protected from over

voltage drive thanks to a 12V clamping protection

circuit.

Moreover, a standby feature allows very low qui-

escent current when activated, but keeping safe

the external power element when Off.

The IC is suitable for 12V car accessories, as well

as other DC/DC step down converters.

APPLICATION DIAGRAM

ORDER CODE

D = Small Outline Package (SO) - also available in Tape & Reel (DT)

PIN CONNECTIONS (top view)

Part Number

Temperature Range

Package

D

TSM108I

-40°, +125°C

•

D

SO14

(Plastic Micropackage)

VCC

G

OV

UV

ICTRL

OSC

GND

VCOMP

VCTRL

ICOMP

VREF

VS

7

6

5

4

3

2

1

8

9

10

11

12

13

14

GD

!STBY

TSM108

VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER

March 2006